replace OVERRIDE and FINAL with override and final in net/

net/disk_cache/backend_unittest.cc

Index: net/disk_cache/backend_unittest.cc
diff --git a/net/disk_cache/backend_unittest.cc b/net/disk_cache/backend_unittest.cc
index 572691c48b719545fb8bb51b4ad35c73124124ac..b3b80b493ada45fb95c1fe44a78d2fa18073d7e6 100644
--- a/net/disk_cache/backend_unittest.cc
+++ b/net/disk_cache/backend_unittest.cc
@@ -1843,7 +1843,7 @@ class BadEntropyProvider : public base::FieldTrial::EntropyProvider {
   virtual ~BadEntropyProvider() {}
 
   virtual double GetEntropyForTrial(const std::string& trial_name,
-                                    uint32 randomization_seed) const OVERRIDE {
+                                    uint32 randomization_seed) const override {
     return 0.5;
   }
 };